What Size Should My Bathroom Ventilation Fan Be? 07/28/2017Ordinary tasks like showering, bathing and shaving can put home-destructive humidity into the air in your Crystal Lake home. There’s good news though—a straightforward bathroom ventilation fan can protect you from deformed wood, mold growth, broken drywall and other problems related with a humid bathroom. Even if you have ventilation fans in your bathrooms, do you know if they’re the proper size? Are they as soft and energy efficient as they could be? Campbell's Tempracure is here to answer your questions. Today’s bathroom ventilation fans are small and modern and they operate more quietly and economically than ever before. You’ll find a hefty range of selections, from average fans that will get the job done to fans with integrated heat lamps, motion sensors and heat-exchanger ventilation that helps avoid warmed air from escaping through your ventilation. While there are a lot of bells and whistles to select from, the most imperative characteristic of your fan is whether or not it’s full-sized enough to do its job. Rated by the cubic feet per minute (CFM) of air they transfer, a bathroom ventilation fan should be able to replace the air in a bathroom at least eight times an hour. With a typical 8-foot ceiling, your ventilation fan should have a CFM rating almost as high as the number of square feet in your bathroom. Therefore, if your bathroom is 5 feet by 8 feet, a CFM rating of 40 would be satisfactory. If you have a larger ceiling, the equation gets a little more difficult. You’ll want to multiply the width of the room by its height and length, divide it by 60 and multiply by 8. Or, to keep it simple, you can use HGTV’s guidance for bathrooms larger than 100 square feet – establish your CFM requirements by adding 50 CFM for every toilet; 50 CFM for each shower, bath and combo; and 100 CFM for each whirlpool. If you’re unsure if your bathroom ventilation fan is the proper size, or you know it’s time for a new one, give the pros at Campbell's Tempracure at call at 815-788-6283. We’re here to help you ensure you have a ventilation fan that will drive hard to care for your home and keep it comfy. You can even schedule an appointment with us online if that’s the most straightforward for you.